SARASOTA, Fla.-- Roper Industries Inc., a medical and industrial equipment maker, said Thursday its third-quarter profit rose 6 percent on stronger sales in three of its four business units. Net earnings for the three months ended Sept. 30 were $117 million, or $1.19 per share, up from $110.3 million, or $1.15 per share, in the third quarter of 2011..